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  #37  
Old 10-14-2010, 03:12 PM
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Re: Water Fording

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Originally Posted by gsingh55 View Post
...and I was always under the impression that water could get sucked up the exhaust if it got submerged, isn't that why some vehicles have the exhaust come up the side?
Exhaust pressure at low depth (i.e. a few inches) is not going to cause a problem. However, for vehicles that have raised exhaust up the side, it is so they can go deep enough that a "normal" exhaust would be a few feet below the surface and that pressure would be enough to stall an engine; think like "the banana in the tailpipe" gag where the pressure builds too high causing an engine to stall.
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  #38  
Old 10-15-2010, 02:11 AM
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Re: Water Fording

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Originally Posted by gsingh55 View Post
I've been really curious about this too...
I have the 2011 Limited w/Hemi no QL
Is the 20inch clearance you are talking about without QL? -
sorry if I should know better - I'm new to Jeeps.

and I was always under the impression that water could get sucked up the exhaust if it got submerged, isn't that why some vehicles have the exhaust come up the side?
Without.
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  #39  
Old 10-15-2010, 06:22 AM
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Re: Water Fording

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Originally Posted by Bmwister View Post
Exhaust pressure at low depth (i.e. a few inches) is not going to cause a problem. However, for vehicles that have raised exhaust up the side, it is so they can go deep enough that a "normal" exhaust would be a few feet below the surface and that pressure would be enough to stall an engine; think like "the banana in the tailpipe" gag where the pressure builds too high causing an engine to stall.
Banana in the tailpipe is a myth. Anything you try to stick in a tailpipe will immediately be shot out like a cannon. Mythbusters even did a segment on this!
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Old 10-15-2010, 07:57 AM
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Re: Water Fording

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Originally Posted by MSCA View Post
Banana in the tailpipe is a myth. Anything you try to stick in a tailpipe will immediately be shot out like a cannon. Mythbusters even did a segment on this!

Yes, but if the engine stalls or water pressure overcomes exhaust pressure, then you have trouble. Water will fill the exhaust system and strangle the engine, or it can back up all the way to the cylinders in a stall situation.
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  #41  
Old 10-15-2010, 09:17 AM
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Re: Water Fording

glad to provide entertainment. thanks for the edumacation that the intake draws air in and the exhaust pipes blow out.

the comedy at boat ramps is even better. guys drop the rear in way too deep, stop the engine and swamp the pipes, end up launching the vehicle into the lake, among other stunts.

it's primarily fear of back pressure after stalling, swamping, and attempting to restart.

so, anyone do any extended fording in water at or above 20" and not worry about it with the stock setup? the jeep vid shows a relatively mellow creek crossing with a brief splashdown in deeper water and then to dry ground. are there no other mods than a raised intake snorkel for other deep water fording in jeeps, rovers, or other AT rigs?
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  #42  
Old 10-15-2010, 09:59 AM
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Re: Water Fording

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Originally Posted by MSCA View Post
Banana in the tailpipe is a myth. Anything you try to stick in a tailpipe will immediately be shot out like a cannon. Mythbusters even did a segment on this!
Correct. That's why I called it a gag but most people still believe this is possible so I referenced that old bit to give visualization the water pressure issue. FWIW, I have some friends who still believe that air pressure and aerodynamics have zero affect on a vehicle's 1/4 mile time or highway fuel economy (when indeed there is).
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  #43  
Old 10-15-2010, 02:48 PM
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Re: Water Fording

Theres a lot to consider when crossing deep water. The intake is most critical as water there can lead to a stalled motor at best and can easily cause catostrophic failure of the motor. The next biggest concern is the breather line for the transmission. Water in a Auto tranny usually means a compelte rebuild. After that the breathers for the differentials, and transfer case. Water in either of those means at best a complete fluid change to keep from having issues. The tailpipe is not too much of a concern because the exhaust pressure of the engine can pretty easily keep that clear. The other issue is just because the intake or breathers are x inches high that doesn't mean that you can cross water that deep. Even at very low speeds the vehical creates a wake that raises the water hieght in front and lowers in in back. Stopping will momentarily reverse this. Inexperienced people will try to cross the water as quickly as possible wich is actually the worst way. Going to fast creates a bigger wake in front, jeopardizing the intake, lessens your reaction time should the water get deeper than you think, and worst off, should you get water in the intake at low rpm's you have a chance at just stalling the engine, at higher rpm's the engine may have enough pull to get the water through the filter and into the cylinders which means bye bye engine. Water doesn't compress very well so the compression stroke of the engine will pretty much send a push rod though the oil pan. I'll try to dig upa video from a old off road trip that show what happens pretty well. Did a lot of water crossings in my wrangler, and saw a few club mates get in trouble
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  #44  
Old 10-15-2010, 03:02 PM
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Re: Water Fording

Very true, one of the other big concerns with cars nowadays is the electronics. If you flood the circuits or computers you will stop dead in your tracks. The new jeeps have sealed transmissions and diffs. There are no breather tubes to allow water to enter. So that is one good thing about the new ones.
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  #45  
Old 10-15-2010, 03:14 PM
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Re: Water Fording

Cool thread, I learned something new today.

*closes notebook.
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  #46  
Old 10-15-2010, 04:41 PM
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Re: Water Fording

I heard mid-year, the WK2 will have water/float setting on the 4x4 select knob! Woot! lol
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  #47  
Old 10-15-2010, 05:31 PM
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Re: Water Fording

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Originally Posted by wingnut View Post
I heard mid-year, the WK2 will have water/float setting on the 4x4 select knob! Woot! lol
I heard mid-year, the WK2 will have water/sub setting on the 4x4 select knob! so you can totally immersed the jeep in the water Woot! lol
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